:root {
  --brand: #ff4d00;
  --brand-deep: #e03a00;
  --brand-soft: #fff4ee;
  --ink: #1c1c1e;
  --ink-secondary: #5c5c62;
  --ink-muted: #8e8e93;
  --line: #ebebef;
  --surface: #ffffff;
  --canvas: #f3f4f6;
  --radius: 14px;
  --shadow-sm: 0 1px 2px rgba(28, 28, 30, 0.04);
  --shadow-md: 0 8px 28px rgba(28, 28, 30, 0.08);
  --font: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  line-height: 1.55;
  background:
    radial-gradient(1200px 480px at 50% -80px, rgba(255, 77, 0, 0.12), transparent 70%),
    linear-gradient(180deg, #fafafa 0%, var(--canvas) 40%, #eef0f3 100%);
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
}

.page-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* 顶栏 */
.topbar {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 20;
}

.topbar-inner {
  max-width: 760px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.02em;
}

.brand-logo {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  object-fit: cover;
  box-shadow: var(--shadow-sm);
}

.topbar-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--ink-muted);
  font-weight: 500;
}

.meta-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #22c55e;
  box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.18);
}

/* 面包屑 */
.crumb {
  max-width: 760px;
  width: 100%;
  margin: 0 auto;
  padding: 14px 20px 0;
  font-size: 12px;
  color: var(--ink-muted);
  text-align: left;
  display: flex;
  justify-content: flex-start;
  align-items: center;
  flex-wrap: wrap;
}

.crumb a:hover {
  color: var(--brand);
}

.crumb-sep {
  margin: 0 6px;
  opacity: 0.5;
}

/* 主内容 */
.main-wrap {
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
  padding: 18px 20px 40px;
  flex: 1;
}

.hero-panel {
  margin-bottom: 18px;
  padding: 28px 24px;
  border-radius: 20px;
  background:
    linear-gradient(135deg, rgba(255, 77, 0, 0.95), rgba(224, 58, 0, 0.88)),
    #ff4d00;
  color: #fff;
  box-shadow: 0 16px 40px rgba(255, 77, 0, 0.22);
  position: relative;
  overflow: hidden;
}

.hero-panel::after {
  content: "";
  position: absolute;
  right: -40px;
  top: -40px;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
  pointer-events: none;
}

.hero-body {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.hero-copy {
  flex: 1;
  min-width: 0;
}

.hero-kicker {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  opacity: 0.85;
  font-weight: 600;
}

.hero-panel h1 {
  margin: 0;
  font-size: 26px;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.25;
}

.hero-desc {
  margin: 10px 0 0;
  font-size: 14px;
  opacity: 0.92;
  max-width: 34em;
}

.trust-row {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  font-size: 13px;
  font-weight: 600;
}

.trust-row li {
  display: flex;
  align-items: center;
  gap: 6px;
}

.trust-row i {
  opacity: 0.9;
}

.hero-qr {
  flex-shrink: 0;
  width: 148px;
  text-align: center;
  padding: 12px 12px 14px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
  color: var(--ink);
}

.qr-frame {
  width: 120px;
  height: 120px;
  margin: 0 auto;
  border-radius: 10px;
  overflow: hidden;
  background: #fff;
}

.qr-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.qr-title {
  margin: 10px 0 0;
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
}

.qr-hint {
  margin: 2px 0 0;
  font-size: 11px;
  color: var(--ink-muted);
}

/* 充值面板 */
.recharge-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 22px 20px 18px;
  box-shadow: var(--shadow-md);
}

.field-block {
  margin-bottom: 22px;
}

.field-block label,
.field-title {
  display: block;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
}

.field-label-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.field-label-row .field-title {
  margin-bottom: 0;
}

.field-hint {
  font-size: 12px;
  color: var(--ink-muted);
}

.field-block input[type="text"] {
  width: 100%;
  padding: 13px 14px;
  border: 1px solid #d8d8de;
  border-radius: 12px;
  font-size: 15px;
  color: var(--ink);
  background: #fafafa;
  transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
}

.field-block input[type="text"]:focus {
  outline: none;
  background: #fff;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(255, 77, 0, 0.15);
}

/* 档位 */
.tier-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.tier-card {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  padding: 16px 14px;
  border: 1.5px solid var(--line);
  border-radius: var(--radius);
  background: #fafafa;
  cursor: pointer;
  text-align: left;
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s, background 0.2s;
}

.tier-card:hover {
  transform: translateY(-2px);
  border-color: #ffc9ad;
  box-shadow: var(--shadow-sm);
}

.tier-card.is-picked {
  background: var(--brand-soft);
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(255, 77, 0, 0.12);
}

.tier-price {
  font-size: 22px;
  font-weight: 800;
  color: var(--ink);
  letter-spacing: -0.03em;
}

.tier-bonus {
  font-size: 13px;
  color: var(--ink-secondary);
}

.tier-tag {
  margin-top: 6px;
  font-size: 12px;
  font-weight: 600;
  color: var(--brand-deep);
}

.tier-tag.muted {
  color: var(--ink-muted);
  font-weight: 500;
}

.badge-hot {
  position: absolute;
  top: 10px;
  right: 10px;
  font-size: 11px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(90deg, #ff3366, #ff4d00);
  padding: 2px 8px;
  border-radius: 999px;
}

/* 支付渠道 */
.channel-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.channel-item {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 12px;
  border: 1.5px solid var(--line);
  border-radius: 12px;
  background: #fff;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  transition: border-color 0.2s, background 0.2s, box-shadow 0.2s;
}

.channel-item:hover {
  border-color: #ffc9ad;
}

.channel-item.is-on {
  border-color: var(--brand);
  background: var(--brand-soft);
  color: var(--brand-deep);
  box-shadow: 0 0 0 3px rgba(255, 77, 0, 0.1);
}

.channel-item[data-channel="alipay"] i {
  color: #1677ff;
  font-size: 22px;
}

.channel-item[data-channel="weixin"] i {
  color: #07c160;
  font-size: 22px;
}

/* CTA */
.cta-btn {
  width: 100%;
  border: none;
  border-radius: 14px;
  padding: 15px 18px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: #fff;
  background: linear-gradient(90deg, var(--brand), var(--brand-deep));
  cursor: pointer;
  box-shadow: 0 10px 24px rgba(255, 77, 0, 0.28);
  transition: transform 0.2s, box-shadow 0.2s, filter 0.2s;
}

.cta-btn:hover {
  transform: translateY(-1px);
  filter: brightness(1.03);
  box-shadow: 0 14px 28px rgba(255, 77, 0, 0.34);
}

.cta-btn:active {
  transform: translateY(0);
}

.safe-tip {
  margin: 14px 0 0;
  text-align: center;
  font-size: 12px;
  color: var(--ink-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

/* 说明区 */
.info-block {
  margin-top: 18px;
  padding: 18px 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: var(--shadow-sm);
}

.info-block h2 {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 8px;
}

.info-block h2 i {
  color: var(--brand);
}

.info-block p {
  margin: 0;
  font-size: 13px;
  color: var(--ink-secondary);
  line-height: 1.7;
}

/* FAQ */
.faq-block {
  margin-top: 28px;
}

.faq-head {
  margin-bottom: 14px;
}

.faq-head h2 {
  margin: 0 0 4px;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.faq-head p {
  margin: 0;
  font-size: 13px;
  color: var(--ink-muted);
}

.accordion {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.acc-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.acc-item:hover {
  border-color: #ffd7c2;
}

.acc-item.expanded {
  border-color: #ffb38a;
  box-shadow: 0 6px 20px rgba(255, 77, 0, 0.08);
}

.acc-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 15px 16px;
  border: none;
  background: transparent;
  cursor: pointer;
  text-align: left;
  font-size: 14px;
  font-weight: 650;
  color: var(--ink);
}

.acc-item.expanded .acc-q {
  color: var(--brand-deep);
}

.acc-icon {
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  background: #f2f2f4;
  color: var(--ink-muted);
  font-size: 11px;
  transition: transform 0.28s ease, background 0.2s, color 0.2s;
}

.acc-item.expanded .acc-icon {
  transform: rotate(45deg);
  background: linear-gradient(135deg, var(--brand), var(--brand-deep));
  color: #fff;
}

.acc-a {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.3s ease;
}

.acc-item.expanded .acc-a {
  grid-template-rows: 1fr;
}

.acc-a > p {
  overflow: hidden;
  margin: 0;
  padding: 0 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-secondary);
}

.acc-item.expanded .acc-a > p {
  padding-bottom: 15px;
}

/* 页脚 */
.site-foot {
  margin-top: auto;
  border-top: 1px solid var(--line);
  background: #1a1b1f;
  color: rgba(255, 255, 255, 0.62);
  font-size: 12px;
}

.foot-inner {
  max-width: 760px;
  margin: 0 auto;
  padding: 28px 20px 32px;
}

.foot-promise {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  padding-bottom: 24px;
  margin-bottom: 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.promise-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.promise-item > i {
  flex-shrink: 0;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  background: rgba(255, 77, 0, 0.16);
  color: #ff8a4c;
  font-size: 14px;
}

.promise-item strong {
  display: block;
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 2px;
}

.promise-item span {
  font-size: 11px;
  line-height: 1.45;
  color: rgba(255, 255, 255, 0.48);
}

.foot-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr 1fr;
  gap: 22px;
  padding-bottom: 24px;
  margin-bottom: 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.foot-col h3 {
  margin: 0 0 10px;
  font-size: 13px;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.02em;
}

.foot-col p {
  margin: 0;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.55);
}

.foot-domain {
  margin-top: 10px !important;
  color: rgba(255, 255, 255, 0.72) !important;
}

.foot-domain a {
  color: #ff8a4c;
  font-weight: 600;
}

.foot-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.foot-links a,
.foot-links span {
  color: rgba(255, 255, 255, 0.55);
  line-height: 1.5;
}

.foot-links a:hover {
  color: #ff8a4c;
}

.foot-legal {
  text-align: center;
}

.legal-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 6px 8px;
  margin-bottom: 14px;
  font-size: 12px;
}

.legal-links a {
  color: rgba(255, 255, 255, 0.7);
}

.legal-links a:hover {
  color: #ff8a4c;
}

.legal-links span {
  color: rgba(255, 255, 255, 0.25);
}

.legal-company,
.legal-addr,
.legal-copy {
  margin: 0;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.42);
}

.legal-company {
  margin-top: 2px;
  color: rgba(255, 255, 255, 0.58);
}

.legal-company a {
  color: rgba(255, 255, 255, 0.78);
}

.legal-company a:hover,
.legal-copy a:hover {
  color: #ff8a4c;
}

.legal-addr {
  margin-top: 4px;
}

.legal-copy {
  margin-top: 8px;
}

.legal-copy a {
  color: rgba(255, 255, 255, 0.58);
}

.legal-sep {
  margin: 0 6px;
  color: rgba(255, 255, 255, 0.2);
}

@media (max-width: 640px) {
  .foot-promise,
  .foot-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .foot-inner {
    padding: 24px 14px 28px;
  }

  .promise-item {
    align-items: center;
  }
}

@media (max-width: 480px) {
  .topbar-inner,
  .crumb,
  .main-wrap {
    padding-left: 14px;
    padding-right: 14px;
  }

  .hero-panel {
    padding: 22px 18px;
    border-radius: 16px;
  }

  .hero-body {
    flex-direction: column;
    align-items: stretch;
    gap: 18px;
  }

  .hero-qr {
    width: 100%;
    max-width: 180px;
    margin: 0 auto;
    padding: 14px;
  }

  .hero-panel h1 {
    font-size: 22px;
  }

  .recharge-panel {
    padding: 18px 14px 14px;
    border-radius: 16px;
  }

  .tier-grid {
    gap: 10px;
  }

  .tier-card {
    padding: 14px 12px;
  }

  .tier-price {
    font-size: 20px;
  }

  .tier-bonus {
    font-size: 12px;
  }

  .channel-item {
    padding: 12px 8px;
    font-size: 14px;
  }

  .trust-row {
    gap: 8px 12px;
    font-size: 12px;
  }
}

@media (min-width: 640px) {
  .tier-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .tier-card,
  .cta-btn,
  .acc-icon,
  .acc-a {
    transition: none;
  }
}